Comparación y validación de los modelos de turbulencia en el estudio numérico de los intercambiadores de Calor

Abstract

This study aims to validate numerical models for heat exchangers developed with the commercial package ANSYS® comparing the results with data published in the literature. The methodology was based on identification of programs, languages, mathematical and numerical models employed by other researchers. Geometries were developed with SolidEdge® and DesignModeler®, discretization meshes with Meshing® and subsequent configuration of standard k-ɛ and k-ω models with Fluent® and CFX®. For internal flow in concentric smooth straight tube exchangers, we recreated the predicted results with Nusselts varying between 100 and 250 and Reynolds regimes between 12*10 3 and 38*10 3 The study of internal flow in curved corrugated tube exhibited a great approach of results predicted with the numerical correlation of Zachar with Nusselt numbers in the range of 15-70 for Dean variations between 1*10 2 and 11*10 2 in laminar flow. Finally, Nusselt variations between 60 and 275 with Dean Numbers between 1*10 3 and 9*10 3 for laminar, transitional and turbulent fully developed flow regime. The study shows the increase of heat flux associated with the change in heat exchangers geometry. Meanwhile, exhibits how computer numerical models can recreate realistic process conditions and thermo-fluid simulation by appropriately configuring systems.